> a colony on the bottom of the ocean would be absolutely invulnerable to almost any catastrophe, maybe except a direct asteroid impact.
Any NATURAL catastrophe. As soon as someone knows you're there (and they will, because building things like that is both literally and metaphorically noisy), and that you have food and shelter while they don't... Well, your invulnerability is going to be put to the test.
> The series is set billions of years in the future of the Earth after the start of the sun's expansion into a red giant has made the surface uninhabitable. It follows the lives of the two million survivors in the underwater city of Salus; its helmsmen, the Caine family; and its pirate enemies. The protagonists of the first issues are Stel Caine, who searches for life-supporting planets with robotic probes, her husband Johl, and their children. Remender summarized the story as being about "one woman's optimism in the face of inevitable and true doom".
Any NATURAL catastrophe. As soon as someone knows you're there (and they will, because building things like that is both literally and metaphorically noisy), and that you have food and shelter while they don't... Well, your invulnerability is going to be put to the test.